Explosive coherer-powder.



STA

ES ATENT FFKGE.

EXPLOSIVE COHERER-POWDER.

no. essaie.

Specification of Letters Patent.

Patented Dec. 11, 1906.

lication filed October 5. 1905. Serial No. 281.519.

.750 It whom it may concern.-

Be it known that I, FERDINAND SCHNEI- DER, a citizen of Germany, residing at Langen'feld, Rhineland, Prussia, Germany, have invented new and useful Improvements in Explosive Coherer-Powder or Explosive Coherer-Filling; and I do hereby declare the following to be a full, clear, and exact description of the same.

My coherer-flling is for use with blasting or mine apparatus, the detonating action of which is effected by spark-producing stations.

The hitherto-known coherer-powders serving to fill coherers are bad conductors in a state of rest and good conductors when influenced or stimulated by electric waves. This property is also possessed by the cohererpowder described in German Patent No. 139,229, which consists of an alloy of copper and zinc in the form of extremely fine and thin leaves possessing very little weight and constituting a very loose and light mass. If a quantity of this filling material is s read across the gap or opening between co iererelectrodes of large surface, large currents can fiow through without the filling becoming heated. If, however, smaller uantities of the filling are taken, of which t e total sectional area does not sufiice'for the current, then the filling -is made incandescent and burns away as soon as such filling is made 00- herent or conductive by means of electric waves. This effect is made use of in the invention described below. If to the known filling material (which is described above) is added a proportion of gunpowder or blasting powder, then a filling for coherers is obtained which can be ignited by means of electric waves.- This filling has in consequence of the addition of gunpowder a higher resistance in a state of rest, as well as when under the influence of electrical waves, because gunowder is a bad conductor in both cases. If some of the described filling is placed on the gap of a large surface coherer and a larger current is switched on the coheret-circuit than the coherer-powder can carry when in its conductive condition, then the coherer mixture is made incandescent by the electrical waves, and the powder contained therein ignites and at the same time burns away.

Having thus described my invention, what I claim as such, and desire to secure by Letters Patent, is-

1. A filling for wave-responsive devices, consisting of an intimate mixture of an explosive with powdered conducting material.

2. A filling for wave-responsive devices, consisting of a powdered material containing an explosive which is a poor electrical conductor.

3. A filling for wave-responsive devices,

consisting of an intimate mixture of gunpow-- der with powdered conducting material.

4. A filling for wave-responsive devices, consisting of an intimate mixture of powdered explosive material with powdered nonexplosive conductive material.

5. A filling for wave-responsive devices, consisting of an intimate mixture containing an explosive and ada ted to become heated upon the passage of electricity therethrough sufficiently to fire the explosive.

In testimony whereof I have signed my name to this specification in thepresence of two Witnesses.

FERDINAND SCHNEIDER.

Witnesses:

BEssIE F. DUNLAP, LOUIS VANDORN. 

